qrious126

one year ago

Hello,
What is the general solution of the following differential equation?
(1 + (x^3/y)sin^2x)dx + (1/y)(x + (1/cos^2(2y))dy = 0;
I used the integrating factor, but I'm stuck at the following step:
u(x) [-x^3sin^2x + 1] = u'(x) [x + (1/cos^2(2y)]
Thanks in advance!